Date: Sun, 04 Sep 2005 22:57:42 +0100 From: Colin Stamp <col.dustbinnospamp.plus.com> Subject: Re: Calibrating Turbocharger
On Sun, 04 Sep 2005 21:44:53 GMT, Malcolm William Mason <mwm1(spam)nospamedu> wrote: >On Sun, 4 Sep 2005 18:25:07 +0200, "Henrik B." <saabnospamPAM_tdcadsl.dk> >wrote: > >> >>"Malcolm William Mason" <mwm1(spam)nospamedu> skrev i en meddelelse >>news:nilkh1tdk2ggd4qt0vb2si6vmkldfodpvdnospamcom... >> >>> This was the reply: >>> "You find a longer steep hill. In 4. or 5. gear, drive with full >>> throttle in >>> the range from 2,500 - 3,500 rpm. Do this 3 or 4 times. The adaption >>> takes >>> place within 2,750 and 3,250 rpm. You need for the car to stay within >>> that >>> rpm-range for at least 4 seconds. >>> >>> If you do nothing, the adaption will take automatically, but will need a >>> longer time." >>> >>> >>> What is being accomplished here? I do not understand what is going on. >> >>Hi Malcolm. >> >>Your car has Saab's Trionic enginemanagement. This is one of the worlds most >>advanced engine control systems. It's an adaptive systems, which means it >>constantly "learns/reads" the driving conditions: Air temp (and moisture), >>hills/mountains, speed a.s.o. >> >>If you for whatever reason disconnect the battery, the Trionic will reset to >>standard values. Once you start driving again, the Trionic needs to learn >>the driving conditions at new. This takes some time, where you might >>experience decreased performance. You can speed up the process, by doing as >>mentioned. >> >>Do you get it? > >Hi Henrik,, > >I am still bewildered. > > >What does it have to "learn" that is not pre-set at the factory? There's a lot of variables that can't be fully known by the factoy setup. i.e. type of fuel, tolerances in injector flow-rates and fuel-pressure, different exhaust fitments etc. etc. > >By the way , do you have any idea as to what speed the auto will be at >during a full throttle down hill 5th gear 3500 revs run? The idea of using a hill is to keep the speed down. You drive up it, not down it. Cheers, Colin.
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